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1 <?php
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2
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3 /*
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4 * This file is part of the Symfony package.
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5 *
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6 * (c) Fabien Potencier <fabien@symfony.com>
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7 *
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8 * For the full copyright and license information, please view the LICENSE
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9 * file that was distributed with this source code.
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10 */
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11
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12 namespace Symfony\Component\CssSelector\Node;
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13
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14 /**
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15 * Represents a node specificity.
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16 *
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17 * This component is a port of the Python cssselect library,
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18 * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
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19 *
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20 * @see http://www.w3.org/TR/selectors/#specificity
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21 *
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22 * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
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23 *
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24 * @internal
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25 */
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26 class Specificity
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27 {
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28 const A_FACTOR = 100;
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29 const B_FACTOR = 10;
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30 const C_FACTOR = 1;
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31
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32 /**
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33 * @var int
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34 */
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35 private $a;
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36
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37 /**
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38 * @var int
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39 */
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40 private $b;
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41
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42 /**
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43 * @var int
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44 */
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45 private $c;
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46
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47 /**
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48 * Constructor.
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49 *
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50 * @param int $a
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51 * @param int $b
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52 * @param int $c
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53 */
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54 public function __construct($a, $b, $c)
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55 {
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56 $this->a = $a;
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57 $this->b = $b;
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58 $this->c = $c;
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59 }
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60
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61 /**
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62 * @param Specificity $specificity
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63 *
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64 * @return self
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65 */
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66 public function plus(Specificity $specificity)
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67 {
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68 return new self($this->a + $specificity->a, $this->b + $specificity->b, $this->c + $specificity->c);
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69 }
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70
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71 /**
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72 * Returns global specificity value.
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73 *
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74 * @return int
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75 */
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76 public function getValue()
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77 {
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78 return $this->a * self::A_FACTOR + $this->b * self::B_FACTOR + $this->c * self::C_FACTOR;
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79 }
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80
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81 /**
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82 * Returns -1 if the object specificity is lower than the argument,
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83 * 0 if they are equal, and 1 if the argument is lower.
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84 *
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85 * @param Specificity $specificity
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86 *
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87 * @return int
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88 */
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89 public function compareTo(Specificity $specificity)
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90 {
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91 if ($this->a !== $specificity->a) {
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92 return $this->a > $specificity->a ? 1 : -1;
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93 }
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94
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95 if ($this->b !== $specificity->b) {
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96 return $this->b > $specificity->b ? 1 : -1;
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97 }
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98
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99 if ($this->c !== $specificity->c) {
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100 return $this->c > $specificity->c ? 1 : -1;
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101 }
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102
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103 return 0;
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104 }
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105 }
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